book Maths Puzzle Numerical Ability

Please help me solve the following problem. Reduce each expression to lowest terms.

4w^2 - 12w +36
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2w^3 + 54

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book Other Question

The distance from the center of a compact disc to the edge of the disc is 6 centimeters. What is the area of the compact disc?
a-36 square centimeters
b-18.84 square centimeters
c-452.16 square centimeters
d- 113.04 square centimeters i need 81^7/4 power simplified